本文選題：衛(wèi)星導(dǎo)航 + 抗干擾��； 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：目前,衛(wèi)星導(dǎo)航技術(shù)在國(guó)民經(jīng)濟(jì)和軍事領(lǐng)域已經(jīng)得到廣泛應(yīng)用。然而,地面和空中接收到的衛(wèi)星信號(hào)非常微弱,完全淹沒(méi)在噪聲之中。因此,衛(wèi)星導(dǎo)航接收機(jī)很容易受到來(lái)自外界的有意或無(wú)意的干擾,從而不能正常工作。因此研究具有抗干擾能力的衛(wèi)星導(dǎo)航接收系統(tǒng)就顯得尤為重要。本文首先介紹了衛(wèi)星導(dǎo)航抗干擾算法的研究背景以及發(fā)展?fàn)顩r,分析了常用的幾種抗干擾技術(shù)的特點(diǎn)。重點(diǎn)研究了兩種空域自適應(yīng)抗干擾算法,即最小均方算法(LMS)和遞歸最小二乘算法(RLS)。針對(duì)LMS算法和RLS所存在的問(wèn)題,提出了改進(jìn)。仿真并分析了改進(jìn)后的LMS算法和RLS算法的性能,比較了兩種算法的干擾抑制能力、復(fù)雜度、收斂性能。最終,選用以白噪聲為參考的RLS算法進(jìn)行硬件實(shí)現(xiàn)。其次,建立了抗干擾實(shí)驗(yàn)所采用的硬件平臺(tái),并進(jìn)行了抗干擾實(shí)驗(yàn)。本文建立的接收機(jī)抗干擾系統(tǒng)采用的是數(shù)字零陷中頻輸出天線系統(tǒng)結(jié)構(gòu)。論文描述了該系統(tǒng)的天線陣列模塊、射頻模塊和數(shù)字信號(hào)處理模塊的主要功能和性能指標(biāo),并給出了系統(tǒng)平臺(tái)硬件程序的實(shí)現(xiàn)。通過(guò)實(shí)際測(cè)試驗(yàn)證了該系統(tǒng)和抗干擾算法能夠有效工作,抑制干擾。最后,針對(duì)寬帶抗干擾需求,研究了GPS接收機(jī)空時(shí)抗干擾技術(shù)。論文給出了空時(shí)自適應(yīng)抗干擾模型,研究了線性約束最小方差(LCMV)算法和基于Frost結(jié)構(gòu)的空時(shí)最小均方(FLMS)算法。在此基礎(chǔ)上,通過(guò)仿真分析和驗(yàn)證了FLMS算法抑制寬帶干擾和窄帶干擾的性能。
[Abstract]:At present, satellite navigation technology has been widely used in the national economy and military fields. However, satellite signals received on the ground and in the air are very weak and completely submerged in noise. Therefore, the satellite navigation receiver is vulnerable to intentional or unintentional interference from the outside world, so it can not work properly. Therefore, it is very important to study the satellite navigation receiving system with anti-jamming ability. This paper first introduces the research background and development status of anti-jamming algorithms for satellite navigation, and analyzes the characteristics of several commonly used anti-jamming techniques. Two spatial adaptive anti-jamming algorithms, the least mean square algorithm (LMS) and the recursive least square algorithm (RLSU), are studied in this paper. Aiming at the problems of LMS algorithm and RLS, the improvement is put forward. The performance of the improved LMS algorithm and the RLS algorithm is simulated and analyzed, and the interference suppression ability, complexity and convergence performance of the two algorithms are compared. Finally, the RLS algorithm with white noise as the reference is selected for hardware implementation. Secondly, the hardware platform of anti-interference experiment is established, and anti-interference experiment is carried out. The receiver anti-jamming system in this paper adopts the digital zero-trapping intermediate frequency output antenna system structure. This paper describes the main functions and performance indexes of the antenna array module, RF module and digital signal processing module of the system, and gives the implementation of the hardware program of the system platform. The test results show that the system and the anti-jamming algorithm can work effectively and suppress interference. Finally, the space-time anti-jamming technology of GPS receiver is studied according to the requirement of wide-band anti-jamming. The space-time adaptive anti-jamming model is presented in this paper. The linear constrained minimum variance LCMV (LCMV) algorithm and the space-time minimum mean square (FLMS) algorithm based on Frost structure are studied. On this basis, the performance of FLMS algorithm to suppress wideband interference and narrowband interference is analyzed and verified by simulation.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN967.1;TN973

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相關(guān)期刊論文 前1條

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本文編號(hào)：2028380